Max number Lun´s

[Ivan_86]

Dear friends,

I need to know how the max. number of luns currently supported by the fiber card A3740A

This card, is configured in my box v2250 and Hpux 11.0 and is conected in a XP256..

Today my range of disc is c45t0d0 to c45t15d0 whit you respective alternate link, the total
of disc is 119. The problem is I,am cannot see more luns to configure in my server, this luns
have configured to my system but my system not see the luns
Tanks ..!!

[Fred Ruffet]

Have you run "insf -e" after setting new luns ?

Regards,

Fred

[Ivan_86]

yes i do

[Steven E. Protter]

Try insf -C

There are limits on how many LINS a non-HP array can present.

I'm not familiar with the XP256. If HP makes it it should be capable of presenting at least 120-128 LUNS.

SEP

[Sanjay_6]

Hi Ivan,

Maybe this doc will help,

http://www.docs.hp.com/hpux/onlinedocs/netcom/maxlun-whitepaper-v1.0.pdf

Hope this helps.

regds

[Stuart Abramson]

3. Volume Set Addressing:

HP Volume Set Addressing is a "workaround" that HP developed
to accomodate the large address space of FCP (Fibre Channel
Protocol).

This sections discusses how VSA works.

a. VSA uses three "address entitites":
o VBUS 0-7
o Target 0-15
o LUN 0-7

c. The "cX" part of the cXtTdD address changes when the VBUS changes
on the same FA.
o Because you could duplicate Target and LUN (device) on the
same string, and that would give you a duplicate address.

4. COUNTS / LIMITS:

a. If you do some arithmetic:
o "String" limit = Targets * LUNs
= 16 * 8 = 128
- However, the VCMDB is 0-0-0, so that leaves 127
on the 1st VBUS string.
o "FA limit" for all VBUS, Targets and LUNS is
= 8 x 128 - 1 = 1023

I can tell you how to change the "vbus" on the EMC Symmetrix; but not on the XP256. You have to call HP and ask them. Maybe someone on this forum knows. Try the "storage forum".

[Dave La Mar]

Ivan -
On your 256 have you alloted these luns to your machine? I.E. secured a path to the machine.

Best of luck.

Regards,

dl

[Angus Crome]

That could easily be firmware or driver version on the HBA (A3740A), or on the XP256 itself. It would have to be pretty old though.
Another thing to think about, as you are approaching your max LUN anyway, you may be saturating that channel with I/O. You should probably start to think about a second path from that server. Can't remember exactly, but that sounds like a card for the K-series, they may be hard to find now.